As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ISSUE- CREW REPORTED BAGGAGE DOOR OPEN MESSAGE APPEARED ON EICAS CLIMBING THROUGH 17000 FEET. LEVELED OFF AT 18000 FEET AND RAN QRH, COMPLIED WITH ALL CHECKLISTS AND DECIDED TO RETURN TO LAS. NO ISSUES WITH PRESSURIZATION HOWEVER AIR RETURNED AS PRECAUTION. CORR ACTION-ADJUSTED LH BAGGAGE DOOR MICROSWITCH. PRESSURIZED AIRCRAFT OPS CHECK GOOD.